Influence of Molecular Weight on the Performance of Organic Solar Cells Based on a Fluorene Derivative
Journal article, 2010
The performance of organic photovoltaic (OPV) bulk-heterojunction blends comprising a liquid-crystalline fluorene derivative and a small-molecular fullerene is found to increase asymptotically with the degree of polymerization of the former. Similar to various thermodynamic transition temperatures as well as the light absorbance of the fluorene moiety, the photocurrent extracted from OPV devices is found to strongly vary with increasing oligomer size up to a number average molecular weight, M-n approximate to 10 kg mol(-1), but is rendered less chain-length dependent for higher M-n as the fluorene derivative gradually adopts polymeric behavior.
thermotropic alignment
morphology
thin-films
polyfluorene copolymer/fullerene blends
field-effect transistors
liquid-crystalline
dependence
polyfluorene
charge-transport
open-circuit voltage
polymer
Author
C. Muller
Linköping University
Ergang Wang
Chalmers, Chemical and Biological Engineering, Polymer Technology
L. M. Andersson
Linköping University
K. Tvingstedt
Linköping University
Y. Zhou
Linköping University
Mats Andersson
Chalmers, Chemical and Biological Engineering, Polymer Technology
Olle Inganäs
Linköping University
Advanced Materials for Optics and Electronics
1616301x (ISSN) 1616-3028 (eISSN)
Vol. 20 13 2124-2131Subject Categories
Chemical Sciences
DOI
10.1002/adfm.201000224